t;r>s 



Report of tJ&e State Geologist. 



The thin-bedded limestones of P> 5 are very fossiliferous, this quarry being 

 one of the best localities for the collecting of Trenton fossils in the lower 

 Mohawk valley. From A 4 and A 5 the following species were collected: 



1. Monticulipora (Prasopord) h/coperdon, (Say). (a) 



2. Stictopora elegantula, Hall. (c) 



3. Rdjmesquina alternata (Con.), Hall and Clarke. (aa) 



4. PUctambonites s<<ri<r(t (Sowb.), II. and C. (c) 



5. Orthis {Dalmanelld) testudmaria, Dal. (c) 



6. Orttiis (DinortMs) pectinella (Emm.), Hall. (r) 



7. Rhynchotrema capax (Con.), Hall. (r) 



8. Raphistoma lenUcula/re, Emm. (?) (r) 



9. MurcMsonia belUcincta, Hall. (r) 



10. MurcMsonia gracilis, Hall. (r) 



11. Asaphus.platycephalus, Stokes. (c) 



12. Trinucleus concentricus, Eaton. (r) 



13. Dalmanites callicephalus (Hall). (r) 



14. Leperditia fdbulites (Con.). (c) 



15. Scliizocrinus nodosus, Hall. (a) 



Segments of stems. 



To the southeast of Pattersonville, and west of Rotterdam, is the high 

 and steep hill named Waterstreet on the Amsterdam topographic sheet of the 

 United States Geological Survey. The top of the northern end of the hill is 

 given as 1,385 feet A. T., and the rocks from near the level of the Mohawk 

 river t<> the top of the hill consist of alternating layers of shales and sand- 

 stones which belong in the Hudson river formation and give a thickness of 

 some 1,125 feet. This, of course forms only a part of the thickness of the 

 Hudson river formation, since it was shown by Ashburner that at Altamont, 

 some ten miles to the south, the thickness of the Hudson river and Utica for- 

 mations taken together is 3,475 feet.* 



Nine-tenths of a mile west of the Schenectady pump station, on the West 

 Shore railroad, are a deep glen and a long cut. The section of the glen and 

 cut is as follows : 



/ ( n . Covered from level of Mohawk river to Erie canal 25 = 25 



O 2 . Fine shale which at the base of the glen does not weather no F = et W 5 

 readily to soil. Graptolites are fairly abundant. 



( n . Very fragile shale exposed in the railroad cut i2= ee i47 



C H . Thin sandstone layer J* et 



* Transactions American Institute of Mining Engineers, Vol. XVI, pp. 961, 952. 



